Show the calculation of a final temperature of the mixture when a 40.5 gram sample of water at 85.7 calculus is added to a 36.8 gram sample of water at 26.3 calculus and a coffee cup calorimeter

the law of conservation of mass states that in a chemical reaction, the total mass of reactants is equal to the total mass of products. because atoms are only rearranged in a chemical reaction, there must be the same number of sodium atoms and chlorine atoms in both the reactants and products

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.